First Results from the Catalina Real-time Transient SurveyWe report on the results from the first six months of the Catalina Real-time Transient Survey (CRTS). In order to search for optical transients with timescales of minutes to years, the CRTS analyses…A. J. Drake, S. G. Djorgovski, A. Mahabal et al.·Sep 8, 2008SaveLearn
A time - luminosity correlation for Gamma Ray Bursts in the X - raysGamma ray bursts (GRBs) have recently attracted much attention as a possible way to extend the Hubble diagram to very high redshift. However, the large scatter in their intrinsic properties prevents…M. G. Dainotti, V. F. Cardone, S. Capozziello·Sep 8, 2008SaveLearn
M31N 2007-11d: A Slowly-Rising, Luminous Nova in M31We report a series of extensive photometric and spectroscopic observations of the luminous M31 nova M31N 2007-11d. Our photometric observations coupled with previous measurements show that the nova…A. W. Shafter, A. Rau, R. M. Quimby et al.·Sep 8, 2008SaveLearn
Mid-infrared interferometry of massive young stellar objectsThe very inner structure of massive young stellar objects (YSOs) is difficult to trace. With conventional observational methods we identify structures still several hundreds of AU in size. However,…H. Linz, B. Stecklum, R. Follert et al.·Sep 8, 2008SaveLearn
Carbon Abundances of Three Carbon-Enhanced Metal-Poor Stars from High-Resolution Gemini-S/bHROS Spectra of the 8727A [C I] LineWe present the results from an analysis of the 8727ang forbidden [C I] line in high-resolution Gemini-S/bHROS spectra of three CEMP stars. We find the [C/Fe] ratios based on the [C I] abundances of…S. C. Schuler, S. J. Margheim, T. Sivarani et al.·Sep 8, 2008SaveLearn
Astrometric suitability of optically-bright ICRF sources for the alignment with the future Gaia celestial reference frameThe ICRF, currently based on the position of 717 extragalactic radio sources observed by VLBI, is the fundamental celestial reference frame adopted by the IAU in 1997. Within the next 10 years, the…G. Bourda, P. Charlot, J. -F. Le Campion·Sep 8, 2008SaveLearn
Angular momentum transport during X-ray bursts on neutron stars: a numerical general relativistic hydrodynamical studyThe distribution of angular momentum of the matter during X-ray bursts on neutron stars is studied by means of 3D axi-symmetric general relativistic hydrodynamics. The set of fully general…A. Hujeirat, F. -K. Thielemann·Sep 8, 2008SaveLearn
AEGIS-X: The Chandra Deep Survey of the Extended Groth StripWe present the AEGIS-X survey, a series of deep Chandra ACIS-I observations of the Extended Groth Strip. The survey comprises pointings at 8 separate positions, each with nominal exposure 200ks,…E. S. Laird, K. Nandra, A. Georgakakis et al.·Sep 8, 2008SaveLearn
Can retired galaxies mimic active galaxies? Clues from the Sloan Digital Sky SurveyThe classification of galaxies as star forming or active is generally done in the ([O III]/Hbeta, [N II]/Halpha) plane. The Sloan Digital Sky Survey (SDSS) has revealed that, in this plane, the…G. Stasinska, N. V. Asari, R. Cid Fernandes et al.·Sep 8, 2008SaveLearn
A critical review of the evidence for M32 being a compact dwarf satellite of M31 rather than a more distant normal galaxySince Baade's photographic study of M32 in the mid 1940s, it has been accepted as an established fact that M32 is a compact dwarf satellite of M31. The purpose of this paper is to report on the…C. K. S. Young, M. J. Currie, R. J. Dickens et al.·Sep 8, 2008SaveLearn
Fast Large-Scale Reionization SimulationsWe present an efficient method to generate large simulations of the Epoch of Reionization (EoR) without the need for a full 3-dimensional radiative transfer code. Large dark-matter-only simulations…Rajat M. Thomas, Saleem Zaroubi, Benedetta Ciardi et al.·Sep 8, 2008SaveLearn
Are mergers responsible for universal halo properties?N-body simulations of Cold Dark Matter (CDM) have shown that, in this hierarchical structure formation model, dark matter halo properties, such as the density profile, the phase-space density…Jie Wang, Simon D. M. White·Sep 8, 2008SaveLearn
Numerical simulations of compressively driven interstellar turbulence: I. Isothermal gasWe performed numerical simulations of supersonic isothermal turbulence driven by mostly compressive large-scale forcing, using both a static grid and adaptive mesh refinement with an effective…Wolfram Schmidt, Christoph Federrath, Markus Hupp et al.·Sep 8, 2008SaveLearn
High Energy Emission from Rotation-Powered Pulsars: Outer-gap vs. Slot-gap ModelsWe explore particle accelerator electrodynamics in the magnetosphere of a rapidly rotating neutron star (NS). We address the importance of a self-consistent treatment of pair production, solving the…Kouichi Hirotani·Sep 8, 2008SaveLearn
A massive binary black-hole system in OJ287 and a test of general relativityTests of Einstein's general theory of relativity have mostly been carried out in weak gravitational fields where the space-time curvature effects are first-order deviations from Newton's…M. J. Valtonen, H. J. Lehto, K. Nilsson et al.·Sep 8, 2008SaveLearn
Timing and Spectral Study of AX J1745.6-2901 with SuzakuThe eclipsing low-mass X-ray binary AX J1745.6-2901 was observed with Suzaku in its outburst phase. Combining the Chandra observation made 1.5 month earlier than Suzaku, we determined the orbital…Yoshiaki Hyodo, Yoshihiro Ueda, Takayuki Yuasa et al.·Sep 8, 2008SaveLearn
The Impact of HI in Galaxies on 21-cm Intensity Fluctuations During the Reionisation EpochWe investigate the impact of neutral hydrogen (HI) in galaxies on the statistics of 21-cm fluctuations using analytic and semi-numerical modelling. Following the reionisation of hydrogen the HI…Stuart Wyithe, Lila Warszawski, Paul M. Geil et al.·Sep 8, 2008SaveLearn
Star cluster kinematics with AAOmegaThe high-resolution setup of the AAOmega spectrograph on the Anglo-Australian Telescope makes it a beautiful radial velocity machine, with which one can measure velocities of up to 350-360 stars per…L. L. Kiss, Z. Balog, Gy. M. Szabo et al.·Sep 8, 2008SaveLearn
Chandra and XMM-Newton observations of the low-luminosity X-ray pulsators SAX J1324.4-6200 and SAX J1452.8-5949We present results from our Chandra and XMM-Newton observations of two low-luminosity X-ray pulsators SAX J1324.4-6200 and SAX J1452.8-5949 which have spin-periods of 172 s and 437 s respectively.…Ramanpreet Kaur, Rudy Wijnands, Alessandro Patruno et al.·Sep 8, 2008SaveLearn
Spatially extended absorption around the z=2.63 radio galaxy MRC 2025-218: outflow or infall?We present an investigation into the absorber in front of the z=2.63 radio galaxy MRC 2025-218, using integral field spectroscopy obtained at the Very Large Telescope, and long slit spectroscopy…A. Humphrey, M. Villar-Martin, S. F. Sanchez et al.·Sep 8, 2008SaveLearn
AGILE detection of delayed gamma-ray emission from GRB 080514BGRB 080514B is the first gamma ray burst (GRB), since the time of EGRET, for which individual photons of energy above several tens of MeV have been detected with a pair-conversion tracker telescope.…A. Giuliani, S. Mereghetti, F. Fornari et al.·Sep 8, 2008SaveLearn
Prevalence of High X-ray Obscuring Columns among AGN that Host H2O MasersOf 104 AGN known to exhibit H2O maser emission, X-ray data that enable estimation of column densities, or lower limits, are available for 42. Contributing to this, we report analysis of new and…Lincoln J. Greenhill, Avanti Tilak, Grzegorz Madejski·Sep 8, 2008SaveLearn
Massive stars in their death-throesThe study of the stars that explode as supernovae used to be a forensic study, working backwards from the remnants of the star. This changed in 1987 when the first progenitor star was identified in…J. J. Eldridge·Sep 7, 2008SaveLearn
Energy Spectrum of the Electrons Accelerated by a Reconnection Electric Field: Exponential or Power Law?The direct current (DC) electric field near the reconnection region has been proposed as an effective mechanism to accelerate protons and electrons in solar flares. A power-law energy spectrum was…W. J. Liu, P. F. Chen, M. D. Ding et al.·Sep 7, 2008SaveLearn
Interaction of a Supernova Shock with the other Star in a Binary SystemInteraction of a fast shock wave generated during a supernova explosion with a magnetized star-companion of the supernova precursor produces a current sheet. We consider the evolution of this current…Yakov Istomin, Fedor Soloviev·Sep 7, 2008SaveLearn